1661157292 has 6 divisors (see below), whose sum is σ = 2907025268. Its totient is φ = 830578644.

The previous prime is 1661157283. The next prime is 1661157293. The reversal of 1661157292 is 2927511661.

It is not an unprimeable number, because it can be changed into a prime (1661157293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207644658 + ... + 207644665.

Almost surely, 2^1661157292 is an apocalyptic number.

It is an amenable number.

1661157292 is a deficient number, since it is larger than the sum of its proper divisors (1245867976).

1661157292 is a wasteful number, since it uses less digits than its factorization.

1661157292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415289327 (or 415289325 counting only the distinct ones).

The product of its digits is 45360, while the sum is 40.

The square root of 1661157292 is about 40757.2974079489. The cubic root of 1661157292 is about 1184.3232421480.

The spelling of 1661157292 in words is "one billion, six hundred sixty-one million, one hundred fifty-seven thousand, two hundred ninety-two".